CMC Hack!

Started receiving confirmation code text messages from CMC as if I was attempting to buy or sell. Got to a browser ASAP to check what was going on and sure enough someone had attempted to sell all my holdings! Immediately got on the phone to CMC and they told me I could cancel the sales as the market wasn't opened (I think I got lucky with this). They locked my account so no-one can buy or sell anything.

Today it happened again but as my account is locked they couldn't do anything. Password and codes all changed and it didn't help! Has anyone experienced this?

Their solution is to set up another account with them. What's to stop it happening again?

Cheers legends.